Abstract

Using a broadband microwave spectrometer we have investigated the magnetization dynamics of mesoscopic ferromagnetic disks and rings in the frequency range from . We studied permalloy rings with an outer diameter of and different ring widths . In the mesoscopic devices we find several ferromagnetic resonance (FMR) lines which shift with the in-plane magnetic field. Among them, two pronounced FMR modes are identified. We attribute these modes to localized spin waves in different ring segments where the characteristic resonance frequency either decreases or increases as a function of , depending on the orientation of the ring segment with respect to .

The authors are grateful to D. Heitmann for his continuous support of the work and K. Rachor for the atomic force microscopy on the nanorings. The authors acknowledge financial support by the BMBF through Grant No. 13N8283 and by the DFG through Graduiertenkolleg “Nanostrukturierte Festkörper.”